I bought the shell, spec as protection while using the wheel. Also, around the terminals, such as to protect the slot for the microSD card in addition. But it remains free. In addition, I had to find the last time bad weather driving, that the dirt and rainwater trapped between the device and silicone sleeve and not dry. Due to the true for the little silicone many money but overall low price I have paid my resending and use the envelope only to transport without a wheel, in the glove compartment or backpack.
